scholarly journals An Attempt to Evaluate the Effect of Varying Time Intervals Between Liming and Cropping on an Oxisol

1969 ◽  
Vol 65 (2) ◽  
pp. 83-89
Author(s):  
J. Badillo-Feliciano ◽  
M. A. Lugo-López
Keyword(s):  
Puerto Rico ◽  
Yield Components ◽  
Field Experiments ◽  
Time Interval ◽  
Time Intervals ◽  
Split Plot ◽  
Significant Yield ◽  
Field Beans ◽  
Plot Design

Field experiments were conducted on an Oxisol with pH 5.0 in northwestern Puerto Rico in an attempt to determine whether the time interval between liming and cropping affected yields, yield components, and other plant characters. Six lime-cropping interval treatments were tested with two cultivars of succeeding crops of field beans and corn in a split plot design. Two cultivars were used as indicator crops in each case. The liming-cropping intervals ranged from planting immediately after liming to planting 10 months after liming (liming on a bimonthly basis). No significant yield differences attributable to treatments could be detected for either crop. In the same fashion, no significant differences were obtained on the various yield components and plant characters studied except for the fact that the 27R fieldbeans from plots limed 10 months prior to planting were smaller than those from plots limed just before planting. The effectiveness of liming Oxisols with pH 5.0 seems not to depend on the time interval that elapses between liming and planting.

scholarly journals Sugarcane Production for 12-, 18-, and 24-Month Cycles Under Conditions in Puerto Rico

1969 ◽  
Vol 54 (1) ◽  
pp. 110-127
Author(s):  
S. Alers-Alers ◽  
M. A. Lugo-López ◽  
R. Gandía Caro
Keyword(s):  
Puerto Rico ◽  
Management Practices ◽  
Field Experiments ◽  
Crop Management ◽  
Total Sugar ◽  
Statistical Analyses ◽  
Sugarcane Production ◽  
Sugarcane Varieties ◽  
Split Plot ◽  
Plot Design

The data presented in this paper are from field experiments conducted at Corozal and Barceloneta following a split plot design where sugarcane cropping cycles or age at harvest (12-, 18-, and 24-month) were the main plots and varieties were the subplots. The varieties studied were: P.R. 1028, P.R. 1016, P.R. 1013, P.R. 980, P.R. 975 and B. 4362. Six replications were used. Statistical analyses of the data revealed that under the conditions prevailing in Puerto Rico, with the sugarcane varieties now available, and under typical current soil and crop management practices, 12- and 18-month canes are more efficient sugar producers than 24-month cane. More cane tonnage and more total sugar per acre per month were obtained during the short cycles than during the 24-month cycle.

Direct and Residual Effect of Planting Method and Phosphorous Levels on Productivity and Agro-Meteorological Indices, Thermal and Energy Efficiencies in Mungbean– Wheat Cropping System

2019 ◽  
Author(s):  
Parveen Kumar ◽  
Karmal Singh ◽  
K D Sharma ◽  
Anil Kumar ◽  
Amit Kumar
Keyword(s):  
Field Experiments ◽  
Residual Effect ◽  
Cropping System ◽  
Research Area ◽  
Yield Attributes ◽  
Planting Methods ◽  
Split Plot ◽  
Raised Bed ◽  
Planting Method ◽  
Plot Design

Field experiments were conducted for two consecutive years during kharif and rabi season of 2015-16 and 2016-17 at Research area, Department of Agronomy, CCSHAU, Hisar to evaluate the direct and residual effect of planting methods and phosphorus levels on productivity, agro-meteorological indices, thermal and energy efficiencies in mungbean– wheat cropping system. The experiment was laid out in split plot design during kharif and in split -split plot design during Rabi with five replications at same site during both the years. Main plot treatments consisted of planting methods viz. furrow irrigated raised bed (FIRB) and conventional where as sub plot consisted of three levels of phosphorus, viz., 30, 40 and 50 kg P2O5 /ha applied to mungbean in kharif and sub -sub treatments applied to wheat in rabi were 40, 50 and 60 kg P2O5 /ha. Sowing of mungbean and wheat crops on beds i.e. furrow irrigated raised bed was superior over conventional sowing in respect of productivity. In mungbean, application of 50 kg P2O5/ha to mungbean significantly increased grain yield over 30 and 40 kg P2O5/ha, respectively but it did not differ significantly with 40 kg P2O5/ha. The residual effect of phosphorous applied to mungbean was found to be non significant on yield attributes and yield of wheat. However, direct application of phosphorous to wheat had significant effect on yield attributes and yield. The agro meteorological indices values were similar under FIRB and conventional method however, thermal and energy efficiencies were higher under FIRB planting as compared to conventional and increased with increasing levels of phosphorous.

Chemical control of chocolate spot disease of field beans

1980 ◽  
Vol 94 (3) ◽  
pp. 497-502 ◽  
Author(s):  
Severa A. Doto ◽  
W. J. Whittington
Keyword(s):  
Yield Components ◽  
Field Experiments ◽  
Severe Infection ◽  
Single Application ◽  
Chocolate Spot ◽  
Small Plot ◽  
Low Levels ◽  
Chocolate Spot Disease ◽  
Field Beans ◽  
Better Than

SummaryThe ability of two chemicals, Benlate and BAS352-04F, to control chocolate spot (Botrytis fabae) disease of field beans (Vicia faba) was examined in five small-plot or field experiments. The incidence of the fungus was never such as to reach the aggressive stage naturally, although severe infection was induced temporarily in certain experiments by enclosing the plots in plastic-covered boxes after inoculation with fungus. Increasing the recommended dose of BAS352-04F but not Benlate resulted in improved control and applying either chemical twice was preferable to a single application. Control by BAS352-04F was sometimes better than Benlate in the early days after infection whereas the reverse was true later. These results are in keeping with their roles as contact, and systemic and contact fungicides respectively. In these small experiments, with low levels of infection, the use of fungicides did not result in significant increases in yield or yield components.

scholarly journals Effect of Irrigation Intervals and Potassium Application Methods on Yield and Yield Components of Wheat Crop Irrigated with Surge Flow

2017 ◽  
Vol 27 (1) ◽  
pp. 29-38
Author(s):  
Hussiun M.A. Ragheb Hussiun M.A. Ragheb
Keyword(s):  
Yield Components ◽  
Field Experiments ◽  
Triticum Aestivum L ◽  
Wheat Crop ◽  
Experimental Station ◽  
Irrigation Interval ◽  
Yield And Yield Components ◽  
Potassium Application ◽  
Department Faculty ◽  
Plot Design

Field experiments were carried out for two consecutive seasons at the Experimental Station of Soil and Water Department‚ Faculty of Agricultural‚ Assiut University, to study the effect of both irrigation intervals and methods of potassium application on yield and yield components of wheat (Triticum aestivum L.) beside potassium content in plant and soil. The experimental design was a split plot design with four replications. The main plots were three irrigation intervals (15, 21 and 28 days), while the sub- plots contained two methods of potassium application (side dressing and fertigation). Results indicated that, shorter irrigation intervals improved yield and yield components of wheat crop. The best yield was obtained from 15 days irrigation interval followed by 21 days. Longer irrigation interval (28 days) produced the least yield and yield components due to water stress conditions. Applying potassium with irrigation water improved yield of wheat crop and potassium contents in grain and straw yields compared to side dressing application. Also it increased the available potassium in soils.

Yield and profitability of groundnut (Arachis hypogaea L.) as influenced by sowing dates and nutrient levels with different varieties

2015 ◽  
Vol 38 (6) ◽  
Author(s):  
R. S. Meena ◽  
R. S. Yadav
Keyword(s):  
Field Study ◽  
Arachis Hypogaea ◽  
Yield Components ◽  
Harvest Index ◽  
Nutrient Levels ◽  
Sowing Dates ◽  
Split Plot ◽  
Crop Stand ◽  
Plot Design

A field study was conducted to evaluate the date of sowing of groundnut (<italic>Arachis hypogaea</italic> L.) during <italic>kharif</italic> 2009 and 2010. Experiment was laid out in split-plot design by assigned dates of sowing (20 April, 15 May, 9 June and 4 July) and varieties (‘HNG 10’ and ‘TG 37A’ ) in main plots and four fertility levels (without fertilizers, 20 N + 40 P<sub>2</sub>O<sub>5</sub>, 30 N + 60 P<sub>2</sub>O<sub>5</sub> and 40 N + 80 P<sub>2</sub>O<sub>5</sub> kg /ha) in sub-plots. Yield components of semi-spreading variety ‘HNG 10’ were statistically at par with each other at different dates of sowing from 20 April to 9 June. Harvest index in both the varieties was observed significantly higher in 4 July sowing. The results of the study showed that significantly higher crop stand at harvest was observed in 9 June and 4 July sowing than all other sowing dates and variety ‘TG 37A’ flowered significantly earlier than ‘HNG10’. Significantly higher yields were recorded in 30 kg N+60 kg P<sub>2</sub>O<sub>5</sub> /ha which was statistically at par with 40 kg N+80 kg P<sub>2</sub>O<sub>5</sub> /ha. On the basis of economics, variety ‘HNG 10’ of groundnut recorded significantly higher net re urn ( 61843/ha) when sown on 9 June.

scholarly journals Chemical Control of Nematodes and Insects in Tomato

1969 ◽  
Vol 68 (1) ◽  
pp. 79-86
Author(s):  
Nelia Acosta ◽  
Carlos Cruz ◽  
Edwin Abreu
Keyword(s):  
Puerto Rico ◽  
Chemical Control ◽  
Field Experiments ◽  
Leaf Miner ◽  
Insect Control ◽  
Nematode Control ◽  
Rotylenchulus Reniformis ◽  
White Grubs ◽  
The Third ◽  
Significant Yield

The effectiveness of four nematicide-insecticides and three insecticides for the control of the reniform nematode (Rotylenchulus reniformis), vegetable leafminer (Lyriomyza sativae), and white grubs (Phyllophaga spp.) on tomatoes (Lycopersicon esculentum), was determined in three field experiments established in 1980 and 1981 at lsabela, Puerto Rico. In the first test permethrin, oxamyl and metamidophos effectively controlled leafminer. Acephate provided moderate control, whereas carbofuran and aldicarb were ineffective. All nematicide-insecticides were effective in the control of R. reniformis in the soil. In the second test, lowest populations of white grubs were collected from plots treated with carbofuran and aldicarb, followed by those treated with oxamyl. In the third test there was a significant decrease of leaf-miner population in carbofuran- and permethrin-treated plots. A reduction of leafminer infestation was also obtained with aldicarb, pydrin and methamidophos. Significant yield increases were obtained from plots treated with both doses of acephate, permethrin, metamidophos and pydrin. Even though a nematode control over 60% was obtained in all treatments, yields from plots treated with nematicides were similar to that from the control, suggesting that yield increases cannot be attributed to insect control or nematode control only, but to the effect of these pesticides on unknown factors in the plant. No phytotoxicity was observed with any of the pesticides in any of the tests.

scholarly journals Effect of Harvesting Sugarcane at 12, 14, and 16 Months of Age Upon Yields at Isabela, P.R.

1969 ◽  
Vol 57 (1) ◽  
pp. 1-8
Author(s):  
S. Alers-Alers ◽  
Frank Juliá ◽  
M. A. Lugo-López
Keyword(s):  
Puerto Rico ◽  
Statistical Analysis ◽  
Field Experiment ◽  
Split Plot ◽  
Plot Design

The data presented in this paper were obtained from a field experiment conducted at Isabela in northwestern Puerto Rico, employing a split plot design in which the age of the sugarcane at harvest (12, 14, and 16 months) was tested in the main plots and eight varieties in the subplots. The varieties were: P.R. 980, P.R. 1117, P.R. 1140, P.R. 1166, P.R. 1148, P.R. 1152, P.R. 1165, and P.R. 1158. Four replications were used. A statistical analysis of the data revealed that higher sugar yields were obtained when the cane was harvested at 16 rather than at 14 or 12 months of age under the conditions prevailing at Isabela and irrespective of variety. Yields also were higher at 14 than at 12 months. These differences were highly significant.

scholarly journals Yield and economics of blackgram crop effected by green manures and phosphorus levels in riceblackgram cropping sequence

2020 ◽  
Vol 15 (4) ◽  
pp. 351-358
Author(s):  
K. Anny Mrudhula ◽  
Y. Suneetha
Keyword(s):  
Green Manure ◽  
Field Experiments ◽  
Rice Crop ◽  
Green Manures ◽  
Green Manure Crop ◽  
Plot Yield ◽  
Split Plot ◽  
Loam Soil ◽  
Phosphorus Levels ◽  
Plot Design

A field experiments was conducted during 2015 and 2016 to study the effect of green manures and phosphorus levels in blackgram crop at Agricultural College Farm, Bapatla. The experiment was conducted in split- split plot design on sandy clay loam soil with three main treatments three subtreatments to Kharif rice and three sub-sub treatments to Rabi crop. The treatments consisted of Dhaincha green manure crop, sunnhemp green manure crop and without green manure as main plot treatments and three phosphorus levels to rice crop comprising of 45 kg P2O5 ha-1, 60 kg P2O5 ha-1 and 75 kg P2O5 ha-1 as sub- plot treatments and are replicated thrice. The Rabi experiment was laid out on the same site in a split-split plot design without disturbing the soil for succeeding blackgram crop and each of the Kharif plot was divided into three sub-sub plots to receive three levels of phosphorus (No P, 50% RDP and 100% RDP) to each plot. Yield and economics of blackgram which received Dhaincha green manure incorporation with 75 kg P2O5 ha-1 to Kharif rice crop and 100% RDP to Rabi blackgram was recorded significantly higher and it was on a par with sunnhemp green manure incorporation with 75 kg P2O5 ha-1 to Kharif rice crop and 100% RDP to Rabi blackgram.

scholarly journals Yield, its components and pest incidence in mixed intercropping of oats (Avena sativa) and field beans (Vicia faba)

1989 ◽  
Vol 61 (1) ◽  
pp. 15-31 ◽  
Author(s):  
Juha Helenius ◽  
Päivi Ronni
Keyword(s):  
Vicia Faba ◽  
Avena Sativa ◽  
Yield Components ◽  
Field Experiments ◽  
Relative Performance ◽  
High Fertility ◽  
Cropping Pattern ◽  
Mixed Cropping ◽  
Pest Incidence ◽  
Field Beans

Seed yields, yield components, pest incidence and damage were examined in two field experiments of mixed intercropping of oats (Avena sativa) with field beans (Vicia faba) in Southern Finland in 1984—1985.The stand types were monocrops and replacement series of mixtures with 2/3 and 1/3 or 1/3 and 2/3 of oats and beans, respectively, on plots treated or not treated with insecticide. In the first season when the overall performance of the crops was poor and the numbers of the main pest Rhopalosiphum padi (Horn., Aphididae) on oats low, the Land Equivalent Ratio (LER) index indicated an intercropping advantage in the bean yield and a disadvantage in the oat yield, the insecticide treatment having no effect on the overall nor on the relative performance of the component crops. The site used during the second season was of high fertility, thus favouring oats over beans. The LERs indicated no advantage or disadvantage in mixed cropping for either oats or beans when R. padi was not controlled. Spraying against R. padi improved the performance of oats, the mixture with 1/3 oats showing an advantage over the monocrop. Simultaneously, there were signs (p = 0.08) of a reduction in the relative performance of the beans. The indicative results support the hypothesis of interspecific dynamics in compensatory yielding as an element of improved reliability in intercropping. The yield components most sensitive to the change in cropping pattern were the number of panicles per plant in oats and the seed weight in beans, both increasing in the mixtures. Compared to known responses to stand density in monocrops, the beans responded to the mixed cropping in a more specific way than the oats. Mixed cropping increased the numbers of aphids in oats. There were signs of a reduced incidence, but not of a reduced average colony size, of Aphis fabae, and of a reduced rate of notching by Sitona spp. weevils on beans in mixed cropping. The results for damage by the frit fly (Oscinella frit) were inconclusive.

scholarly journals Production and quality of cowpea seeds desiccated with saflufenacil and flumioxazin

2021 ◽  
Vol 25 (3) ◽  
pp. 209-215
Author(s):  
Jeovane N. Silva ◽  
Adriano Jakelaitis ◽  
Jacson Zuchi ◽  
Leandro S. Pereira ◽  
Estevam M. Costa ◽  
...  
Keyword(s):  
Yield Components ◽  
Physiological Maturity ◽  
Cowpea Seeds ◽  
Split Plot ◽  
Physiological Quality ◽  
Technological Quality ◽  
Main Factor ◽  
Plot Design

ABSTRACT The use of desiccants allows to anticipate cowpea harvest at a time closer to physiological maturity. The desiccants saflufenacil and flumioxazin promote the drying and falling of leaves and loss of water from seeds. This study aimed to evaluate the effects of saflufenacil and flumioxazin doses applied to the cowpea crop on the production and quality of seeds at harvest and after storage for six months. Two experiments were carried out in a split-plot design (5 × 2). In the first experiment, the main factor consisted of saflufenacil doses (0, 25, 50, 100, and 150 g ai ha-1), while the second factor consisted of evaluation periods (after harvest and six months after harvest). In the second experiment, the main factor consisted of flumioxazin doses (0, 10, 20, 30, and 40 g ai ha-1) and the second factor consisted of the same evaluation periods. The treatments were designed in randomized blocks, with four replications. Saflufenacil application from 25 g ha-1 compromised the yield components and technological quality, while flumioxazin doses did not affect the yield components. Storage at 20 °C for six months decreased the physiological quality of seeds. Flumioxazin application at cowpea harvest promoted uniformity of maturity and harvest anticipation, without compromising the physiological quality after harvest.

Sign in / Sign up

Export Citation Format

Share Document